hm, that orbital is red. i would have liked to see a whole wing of this bird 'cause looking at the bleached coverts there's no visible renewed adult type grey feather which would be typical for micha, esp. the median covert row; wing coverts look very like in herring gull at this age...
i don't know what to do with that red orbital since i think it is really rare among western herring gulls (does it occure at all? - baltic HG can well show it). 2nd gen. tertials appear to have full dark centers, double pale margin seems to be worn away but this occures in HG also. upper TT replaced for 3rd gen. ones.
now, if it is a michahellis, it is a very retarded one, in terms of covert replacement. didn't it stand up at all? normally legs should be yellow now in YLG

head looks like the one of a micha indeed (squarish, strong gonys to bill).
can't ID it by this pic only but certainly has something YLG-ish, esp. red orbital.